Herbicides
CA 2059609 A1 · Owner: Cramp, Susan Mary · Inventors: Cramp, Susan Mary; Cain, Paul Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula I, wherein: R represents an optionally substituted alkyl or all optionally substituted cycloalkyl group;, R1 represents halogen -O(CH2)mOR5, cyano, -SR5, R5. -CO2R5 or alkyl substituted by OR5;, R2 and R3 represent halogen hydrogen, R5, alkyl substituted by -OR5 nitro, cyano, -OR5-O(CH2)mORS or -CO2RS; R4 and R5 represent an optionally substituted alkyl group; n represents zero, 1 or 2 and, m represents an integer from 1 to 3; and agriculturally acceptable salts of enolic tautomeric forms thereof are useful as herbicides.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 17, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.